I only started wearing a HR monitor a few years ago. Last year, at 56, I hit 186bpm several times. This year, with no racing (due to Covid) I have only hit maybe 183 while killing myself on a couple Strava segments.
But I'm not really sure why it matters. I've read (could be wrong) that max HR is not really trainable and not indicative of fitness...It's just an individual thing.